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Hudson commented on HDFS-1875:
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Integrated in Hadoop-Hdfs-trunk-Commit #746 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk-Commit/746/])
> MiniDFSCluster hard-codes dfs.datanode.address to localhost
> -----------------------------------------------------------
>
> Key: HDFS-1875
> URL: https://issues.apache.org/jira/browse/HDFS-1875
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 0.22.0
> Reporter: Eric Payne
> Assignee: Eric Payne
> Fix For: 0.23.0
>
> Attachments: HDFS-1875.patch, HDFS-1875.patch
>
>
> When creating RPC addresses that represent the communication sockets for each simulated
DataNode, the MiniDFSCluster class hard-codes the address of the dfs.datanode.address port
to be "127.0.0.1:0"
> The DataNodeCluster test tool uses the MiniDFSCluster class to create a selected number
of simulated datanodes on a single host. In the DataNodeCluster setup, the NameNode is not
simulated but is started as a separate daemon.
> The problem is that if the write requrests into the simulated datanodes are originated
on a host that is not the same host running the simulated datanodes, the connections are refused.
This is because the RPC sockets that are started by MiniDFSCluster are for "localhost" (127.0.0.1)
and are not accessible from outside that same machine.
> It is proposed that the MiniDFSCluster.setupDatanodeAddress() method be overloaded in
order to accommodate an environment where the NameNode is on one host, the client is on another
host, and the simulated DataNodes are on yet another host (or even multiple hosts simulating
multiple DataNodes each).
> The overloaded API would add a parameter that would be used as the basis for creating
the RPS sockets. By default, it would remain 127.0.0.1
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